The S14B23 is a 2.3 L petrol inline-4 from BMW's S14 family, built 1986–1991 and rated at 200 hp and 240 Nm. It powered the BMW E30 M3 and BMW E30 M3 Evolution.
This guide is about the S14B23 specifically: its specification, the cars that use it, how it differs from the other S14 versions, what to check, prices from our stock and fitment answers for each model. For the history of the whole family, read our S14 guide.
- Capacity and layout: 2.3 L, inline-4, naturally aspirated
- Output: 200 hp and 240 Nm
- Production: 1986–1991
- Fitted to: 2 models across 1 chassis generation
- In our stock: ask the desk for the next arrival
S14B23 specifications
| Item | Value |
|---|---|
| Engine code | S14B23 |
| Family | S14 |
| Capacity | 2.3 L |
| Layout | Inline-4 |
| Fuel | Petrol |
| Aspiration | Naturally aspirated |
| Power | 200 hp |
| Torque | 240 Nm |
| Specific output | 87 hp per litre |
| Production | 1986–1991 |
| Models | 2 |
S14B23: 2.3 L, inline-4, petrol, naturally aspirated. Output is 200 hp with 240 Nm of torque, and production ran from 1986 to 1991. That is about 87 hp and 104 Nm per litre, a strong figure for a road engine of its era. Within the S14 family, it is the most powerful version, while the S14B20 (192 hp) is milder. It was fitted to the BMW E30 M3 and BMW E30 M3 Evolution.
What the code S14B23 means
- S marks an S-series code, reserved for engines developed by BMW M.
- 14 is the family number.
- B stands for petrol (from the German Benzin).
- 23 is the capacity in decilitres, so 2.3 litres.
Which BMW models use the S14B23
| Model | Generation | Built |
|---|---|---|
| BMW E30 M3 | second 3 Series | 1982–1994 |
| BMW E30 M3 Evolution | second 3 Series | 1982–1994 |
In the E30 second 3 Series (1982–1994), the S14B23 powered the M3 and M3 Evolution. Engines from other models fit the E30 as long as the sump, mounts and ancillaries match, which we check against your VIN. All E30 engines
S14B23 compared with other S14 versions
| Code | Capacity | Power | Torque | Years |
|---|---|---|---|---|
| S14B20 | 2.0 L | 192 hp | 210 Nm | 1986–1991 |
| S14B23 | 2.3 L | 200 hp | 240 Nm | 1986–1991 |
S14B23 or S14B20?
The S14B20 has 8 hp less than the S14B23 (192 against 200 hp), from 2.0 L instead of 2.3 L, and was built 1986–1991. A different capacity means a different crankshaft, pistons or head, and different software. It can be fitted as an upgrade with the matching engine control unit and wiring, but it is a conversion rather than a straight replacement.
Common S14B23 problems
The S14B23 shares its weak points with the rest of the S14 family. These are the faults to check on a used unit and on your own engine. The full explanation of each is in the S14 guide.
| Known fault | What to check |
|---|---|
| Valve clearances | Ask for the last clearance check and a leak-down test. |
| Timing chain and guides | Inspect guides and listen for a cold-start rattle. |
| Throttle body linkage | Check for free play and even opening across the four throttles. |
| Bearing wear on track engines | Look at the oil analysis or open the sump on unknown engines. |
Throttle body linkage. Wear in the ITB linkage causes uneven idle and poor response.
S14B23 maintenance
- 10W-60 or 15W-50 synthetic is typical, about 4.5 litres.
- Oil every 7,500 km; valves checked every 15,000 to 20,000 km.
- Timing chain driving both camshafts.
Will the S14B23 fit my car?
S14B23 prices
We do not have an S14B23 on the shelf at the moment. Send us your VIN or the code you need and the desk will tell you when the next unit arrives and what it will cost.
Buying a used S14B23: checklist
- Compression or leak-down figures. Even compression across all cylinders tells you more than mileage. Ask for the figures, not just a pass or fail, and compare the highest and lowest readings: a spread above 10 to 15 percent deserves a question.
- Sump, oil pickup and drive variants. Rear-drive, xDrive and front-drive cars can use different sumps, oil pickups and engine mounts even with the same engine code. Check that the sump matches your subframe and front axle.
- List of what is fitted. Engines are sold with different ancillaries: some have the turbo, injectors, manifolds, alternator and starter, others are long blocks. Agree the list in writing so you know which parts must come from your old engine.
- Confirm the exact engine code. Read the code stamped on the block and compare it with the code for your car. Send us the last seven characters of the VIN and we confirm the match before anything is paid.
- Look at the oil and coolant. Clean oil without metal particles and coolant without oil are good signs. Milky oil, oily coolant or a burnt smell mean the engine needs further checks before it is fitted.
- Timing chain noise. Listen for a rattle at the front of the engine for the first seconds after a cold start. On an engine that cannot be run, look at the chain guides through the oil filler or with the valve cover off.
- Bearing and valve clearance history. M engines are built to tighter tolerances. Ask for the last rod bearing replacement and valve clearance check, and consider an oil analysis if the engine can be run.
- Originality and numbers. For collectible cars, the engine number and correct ancillaries add value. Photograph the stamp and keep it with the car's documents.
Questions about the S14B23
Is the BMW S14B23 a diesel or petrol engine?
The S14B23 is a petrol engine. It is a 2.3 liter (2,302 cc) inline 4, DOHC, 16 valve unit with no turbo (naturally aspirated), and it was built to the Euro 1 emission standard.
The emission standard matters for registration and for low-emission zones in many cities. When you replace an engine with the same code, the car keeps the same paperwork and the same emission class.
Petrol versions need the correct catalytic converters and oxygen sensors on the car to stay legal and to keep the engine computer happy. Reuse the parts from your car if they are in good condition.
If you are not sure which version you need, send us your VIN. We tell you the right code for free.
See all S14 Engines · Search S14B23 in the shop
How long does delivery of an S14B23 engine take?
Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day. Delivery to the Netherlands, Belgium, Germany, France, Luxembourg and Denmark takes 1 to 3 working days.
Spain, Italy, Portugal, Poland, Czechia, Austria, Ireland, the Nordics and the Baltics take 2 to 5 working days. Greek and Spanish islands, Malta, Cyprus and remote areas take 4 to 8 working days. The UK and other countries outside the EU are quoted one by one.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Every engine is drained, sealed at each opening, strapped to a heat-treated pallet and shrink-wrapped, then photographed before it leaves the yard.
You get a tracking number when the pallet is collected. Check the wrapping before you sign, and note any damage on the paperwork.
See all S14 Engines · Search S14B23 in the shop
What should I replace when I fit a used S14B23 engine?
A used engine lasts longest when it starts life in your car with fresh fluids and new seals. Fit a new oil filter and fresh oil of the grade BMW lists for this engine, and refill the coolant with the correct BMW antifreeze mix. Change the drive belt, the thermostat and the water pump seals if they look tired, because they are cheap while the engine is out. Use new gaskets for the exhaust manifold, the intake and the sump plug, and check every hose clip before the first start.
Look at the engine mounts and the clutch or the torque converter while the engine is out. Old mounts can crack a new engine's brackets, and a worn clutch is much easier to change now.
Before the first start, turn the engine over without fuel until the oil pressure light goes out. Then let it idle, check for leaks, and drive gently for the first few hundred kilometres.
The warranty asks for fitting by a qualified mechanic and the correct oil, coolant and filters. Keep your receipts in case you ever need to make a claim.
See all S14 Engines · Search S14B23 in the shop
What comes with a used S14B23 engine?
Each S14B23 is sold as described on its own listing. The yard writes down the parts that are fitted to that unit, such as the turbo, the injectors, the manifolds or the alternator, so you know what arrives.
Some units are long engines with few ancillaries, others are more complete. If you need a part that is not listed, ask the desk. We often have the matching items in the yard.
Every engine is drained, sealed at each opening, strapped to a heat-treated pallet and shrink-wrapped, then photographed before it leaves the yard.
On delivery, the carrier brings the pallet to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready.
See all S14 Engines · Search S14B23 in the shop
Can you check if an S14B23 fits my car with my VIN?
Yes, and it is free. Send the 17-character VIN of your car and, if you have it, the gearbox code. We check the engine family, the build year window and the parts your car needs.
For the S14B23, we confirm that your car was built with this code or with a version that can take it. BMW used it in the BMW E30 M3, BMW E30 M3 Evolution and BMW E30 M3 Sport Evolution.
We only reserve an engine once the match is confirmed, so you never pay for the wrong unit. You can reach the Hamburg desk by email at autowerkeengines@gmail.com, or by phone and WhatsApp on +49 15510 030835, Monday to Friday, 9:00 to 16:00 CET.
You can also use the VIN check on our site. It reads the year, the make, the model and the engine from the public vehicle register.
See all S14 Engines · Search S14B23 in the shop
Does a used S14B23 engine come with a warranty?
Yes. Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop.
The warranty does not cover damage from wrong fitting, overheating, low oil, wrong fluids or fuel, engines that were opened or modified without our approval, or labour and towing costs.
To claim, send us your order number, a short description of the problem, photos or a video, and a mechanic's report if we ask for one. If the claim is approved, we repair, replace or refund the engine.
Keep the receipts for the fitting, the oil and the filters. They make any claim quick and simple.
See all S14 Engines · Search S14B23 in the shop
Are there other versions of the BMW S14B23?
In our yard the S14B23 is the only listed version of the S14 family. It makes 147 kW (200 HP) and 240 Nm, and was built from 1986 to 1991.
Engines in one family share a basic block, but the turbo, the injection, the sensors and the engine computer can differ. A higher power version often has different pistons, a bigger turbo or a different fuel system.
This is why we ask for the exact code. Fitting a different version can work, but the wiring, the software and sometimes the gearbox must be changed to match.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all S14 Engines · Search S14B23 in the shop
How much is a replacement S14B23 engine for a BMW E30 M3?
A used S14B23 for the BMW E30 M3 costs from about 5.850 € to 8.950 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.
A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The S14B23 you buy is photographed and checked in Hamburg before it is listed.
Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop. Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all S14 Engines · Search S14B23 in the shop
Will the S14B23 engine fit my BMW E30 M3 Sport Evolution?
Yes, if your BMW E30 M3 Sport Evolution was built with the S14B23. BMW used this 2.3 liter (2,302 cc) petrol engine with 147 kW (200 HP) in the E30 M3 Sport Evolution from about 1986 to 1991.
In our records the S14B23 is the engine for the E30 M3 Sport Evolution, which makes the match simple. Still, check the code on your old engine or send us your VIN.
Also tell us if your E30 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all S14 Engines · Search S14B23 in the shop
How do I know a used S14B23 engine is in good shape?
Each engine in the yard is inspected in Hamburg. The code is matched to the listing, the parts on the engine are recorded, the openings are sealed and the real unit is photographed. An inspection certificate for the unit can travel with the order when you ask for it.
When you look at a listing, check the recorded mileage, the year and the photos of the ports and the stamp. Ask for photos of anything you want to see closer. Ask the desk for more pictures of any listing. We are happy to show the stamp, the ports and the ancillaries before you decide.
On a petrol engine like the S14B23, a careful fitter will also look at the spark plugs, the coils and the timing side before the engine goes in.
If the engine fails inside under normal use, the warranty covers you. Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop.
See all S14 Engines · Search S14B23 in the shop
How much is a replacement S14B23 engine for a BMW E30 M3 Evolution?
A used S14B23 for the BMW E30 M3 Evolution costs from about 5.850 € to 8.950 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.
A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The S14B23 you buy is photographed and checked in Hamburg before it is listed.
Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop. Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all S14 Engines · Search S14B23 in the shop
How much does a used BMW S14B23 engine cost?
A used BMW S14B23 engine in our yard usually costs between 5.850 € and 8.950 €. The exact price depends on the year, the mileage and the parts that come with the engine.
Our units show recorded mileage from about 22,000 km up to around 200,000 km. Lower mileage and more ancillaries mean a higher price. Each listing shows its own price, and the price you see is the price you pay. Prices include VAT for private buyers.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. If you order a gearbox or a second engine on the same order, the fee is still charged once.
Inside the EU there is no import duty. For the UK and other non-EU countries, import duty and local VAT are paid by the receiver, and we supply a commercial invoice.
See all S14 Engines · Search S14B23 in the shop
How much power and torque does the BMW S14B23 have?
From the factory the BMW S14B23 makes 147 kW (200 HP) and 240 Nm of torque. It is a 2.3 liter (2,302 cc) inline 4, DOHC, 16 valve petrol engine with no turbo (naturally aspirated).
Without a turbo, the power builds smoothly with the revs. A clean air intake, healthy ignition and the correct fuel are key to getting the full figure.
A used engine reaches its factory numbers when it is fitted with the matching engine computer and software, and serviced with the right oil and filters. If the engine computer from your car is a different version, a specialist may need to code it.
Every S14B23 on our site lists its year and mileage. If you want more photos or a short video of a unit, ask the desk and we send them before you pay.
See all S14 Engines · Search S14B23 in the shop
Which cars use the BMW S14B23 engine?
BMW fitted the S14B23 to the BMW E30 M3, BMW E30 M3 Evolution and BMW E30 M3 Sport Evolution. These cars were built with this engine from about 1986 to 1991.
The badge on the boot is not enough to be sure. The same model name can hide two different engines, for example after a facelift or a change in emission rules. Always read the engine code stamped on the block, or look it up with your VIN.
The S14B23 is the only S14 version we list, which makes it easy to pick, but the wiring and the engine computer still need to match your car.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all S14 Engines · Search S14B23 in the shop
How much is a replacement S14B23 engine for a BMW E30 M3 Sport Evolution?
A used S14B23 for the BMW E30 M3 Sport Evolution costs from about 5.850 € to 8.950 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.
A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The S14B23 you buy is photographed and checked in Hamburg before it is listed.
Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop. Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all S14 Engines · Search S14B23 in the shop
What is the BMW S14B23 engine?
The BMW S14B23 is a 2.3 liter (2,302 cc) petrol engine from the S14 family. It has an inline 4, DOHC, 16 valve layout with no turbo (naturally aspirated), and makes 147 kW (200 HP) with 240 Nm of torque. BMW built it from 1986 to 1991 and it meets the Euro 1 emission standard.
You find the S14B23 in the BMW E30 M3, BMW E30 M3 Evolution and BMW E30 M3 Sport Evolution. What we list: BMW S14 four-cylinder engines from the E30 M3.
At Autowerke Engines every S14B23 is a real used engine from our yard in Hamburg. Before a unit is listed, the yard checks the engine code against the listing, writes down the parts fitted to it, seals every opening and photographs the real engine you will receive. Each listing shows the year, the mileage and the price, so you can compare units side by side.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all S14 Engines · Search S14B23 in the shop
Will the S14B23 engine fit my BMW E30 M3 Evolution?
Yes, if your BMW E30 M3 Evolution was built with the S14B23. BMW used this 2.3 liter (2,302 cc) petrol engine with 147 kW (200 HP) in the E30 M3 Evolution from about 1986 to 1991.
In our records the S14B23 is the engine for the E30 M3 Evolution, which makes the match simple. Still, check the code on your old engine or send us your VIN.
Also tell us if your E30 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all S14 Engines · Search S14B23 in the shop
Will the S14B23 engine fit my BMW E30 M3?
Yes, if your BMW E30 M3 was built with the S14B23. BMW used this 2.3 liter (2,302 cc) petrol engine with 147 kW (200 HP) in the E30 M3 from about 1986 to 1991.
In our records the S14B23 is the engine for the E30 M3, which makes the match simple. Still, check the code on your old engine or send us your VIN.
Also tell us if your E30 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all S14 Engines · Search S14B23 in the shop
Delivery, warranty and payment
Before an S14B23 leaves our Hamburg yard it is drained of oil and coolant, every opening is sealed, and it is strapped to a pallet and wrapped. We send photographs of the packed unit and the tracking details.
Delivery is door to door and included in the price. Most European addresses receive the engine within five to ten working days; Germany and its neighbours are usually faster.
A 12-month warranty covers eligible internal failure when the engine is fitted by a qualified workshop with new fluids and filters. You can pay by card, bank transfer or crypto and receive the invoice by email straight away.
